git/builtin/reset.c

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/*
* "git reset" builtin command
*
* Copyright (c) 2007 Carlos Rica
*
* Based on git-reset.sh, which is
*
* Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
*/
#include "cache.h"
#include "tag.h"
#include "object.h"
#include "commit.h"
#include "run-command.h"
#include "refs.h"
#include "diff.h"
#include "diffcore.h"
#include "tree.h"
#include "branch.h"
#include "parse-options.h"
#include "unpack-trees.h"
#include "cache-tree.h"
static const char * const git_reset_usage[] = {
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
"git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]",
"git reset [-q] <commit> [--] <paths>...",
"git reset --patch [<commit>] [--] [<paths>...]",
NULL
};
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
static const char *reset_type_names[] = {
N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
};
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
static char *args_to_str(const char **argv)
{
char *buf = NULL;
unsigned long len, space = 0, nr = 0;
for (; *argv; argv++) {
len = strlen(*argv);
ALLOC_GROW(buf, nr + 1 + len, space);
if (nr)
buf[nr++] = ' ';
memcpy(buf + nr, *argv, len);
nr += len;
}
ALLOC_GROW(buf, nr + 1, space);
buf[nr] = '\0';
return buf;
}
static inline int is_merge(void)
{
return !access(git_path("MERGE_HEAD"), F_OK);
}
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
static int reset_index_file(const unsigned char *sha1, int reset_type, int quiet)
{
int nr = 1;
int newfd;
struct tree_desc desc[2];
struct unpack_trees_options opts;
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
memset(&opts, 0, sizeof(opts));
opts.head_idx = 1;
opts.src_index = &the_index;
opts.dst_index = &the_index;
opts.fn = oneway_merge;
opts.merge = 1;
if (!quiet)
opts.verbose_update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
switch (reset_type) {
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
case KEEP:
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
case MERGE:
opts.update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
break;
case HARD:
opts.update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
/* fallthrough */
default:
opts.reset = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
}
newfd = hold_locked_index(lock, 1);
read_cache_unmerged();
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
if (reset_type == KEEP) {
unsigned char head_sha1[20];
if (get_sha1("HEAD", head_sha1))
return error(_("You do not have a valid HEAD."));
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
if (!fill_tree_descriptor(desc, head_sha1))
return error(_("Failed to find tree of HEAD."));
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
nr++;
opts.fn = twoway_merge;
}
if (!fill_tree_descriptor(desc + nr - 1, sha1))
return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
if (unpack_trees(nr, desc, &opts))
return -1;
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock))
return error(_("Could not write new index file."));
return 0;
}
static void print_new_head_line(struct commit *commit)
{
const char *hex, *body;
hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
printf(_("HEAD is now at %s"), hex);
body = strstr(commit->buffer, "\n\n");
if (body) {
const char *eol;
size_t len;
body += 2;
eol = strchr(body, '\n');
len = eol ? eol - body : strlen(body);
printf(" %.*s\n", (int) len, body);
}
else
printf("\n");
}
static int update_index_refresh(int fd, struct lock_file *index_lock, int flags)
{
int result;
if (!index_lock) {
index_lock = xcalloc(1, sizeof(struct lock_file));
fd = hold_locked_index(index_lock, 1);
}
if (read_cache() < 0)
return error(_("Could not read index"));
result = refresh_index(&the_index, (flags), NULL, NULL,
_("Unstaged changes after reset:")) ? 1 : 0;
if (write_cache(fd, active_cache, active_nr) ||
commit_locked_index(index_lock))
return error ("Could not refresh index");
return result;
}
static void update_index_from_diff(struct diff_queue_struct *q,
struct diff_options *opt, void *data)
{
int i;
int *discard_flag = data;
/* do_diff_cache() mangled the index */
discard_cache();
*discard_flag = 1;
read_cache();
for (i = 0; i < q->nr; i++) {
struct diff_filespec *one = q->queue[i]->one;
if (one->mode) {
struct cache_entry *ce;
ce = make_cache_entry(one->mode, one->sha1, one->path,
0, 0);
if (!ce)
die(_("make_cache_entry failed for path '%s'"),
one->path);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD |
ADD_CACHE_OK_TO_REPLACE);
} else
remove_file_from_cache(one->path);
}
}
static int interactive_reset(const char *revision, const char **argv,
const char *prefix)
{
const char **pathspec = NULL;
if (*argv)
pathspec = get_pathspec(prefix, argv);
return run_add_interactive(revision, "--patch=reset", pathspec);
}
static int read_from_tree(const char *prefix, const char **argv,
unsigned char *tree_sha1, int refresh_flags)
{
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
int index_fd, index_was_discarded = 0;
struct diff_options opt;
memset(&opt, 0, sizeof(opt));
diff_tree_setup_paths(get_pathspec(prefix, (const char **)argv), &opt);
opt.output_format = DIFF_FORMAT_CALLBACK;
opt.format_callback = update_index_from_diff;
opt.format_callback_data = &index_was_discarded;
index_fd = hold_locked_index(lock, 1);
index_was_discarded = 0;
read_cache();
if (do_diff_cache(tree_sha1, &opt))
return 1;
diffcore_std(&opt);
diff_flush(&opt);
diff_tree_release_paths(&opt);
if (!index_was_discarded)
/* The index is still clobbered from do_diff_cache() */
discard_cache();
return update_index_refresh(index_fd, lock, refresh_flags);
}
static void prepend_reflog_action(const char *action, char *buf, size_t size)
{
const char *sep = ": ";
const char *rla = getenv("GIT_REFLOG_ACTION");
if (!rla)
rla = sep = "";
if (snprintf(buf, size, "%s%s%s", rla, sep, action) >= size)
warning(_("Reflog action message too long: %.*s..."), 50, buf);
}
static void die_if_unmerged_cache(int reset_type)
{
if (is_merge() || read_cache() < 0 || unmerged_cache())
die(_("Cannot do a %s reset in the middle of a merge."),
_(reset_type_names[reset_type]));
}
int cmd_reset(int argc, const char **argv, const char *prefix)
{
int i = 0, reset_type = NONE, update_ref_status = 0, quiet = 0;
int patch_mode = 0;
const char *rev = "HEAD";
unsigned char sha1[20], *orig = NULL, sha1_orig[20],
*old_orig = NULL, sha1_old_orig[20];
struct commit *commit;
char *reflog_action, msg[1024];
const struct option options[] = {
OPT__QUIET(&quiet, "be quiet, only report errors"),
OPT_SET_INT(0, "mixed", &reset_type,
"reset HEAD and index", MIXED),
OPT_SET_INT(0, "soft", &reset_type, "reset only HEAD", SOFT),
OPT_SET_INT(0, "hard", &reset_type,
"reset HEAD, index and working tree", HARD),
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 17:30:31 +00:00
OPT_SET_INT(0, "merge", &reset_type,
"reset HEAD, index and working tree", MERGE),
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
OPT_SET_INT(0, "keep", &reset_type,
"reset HEAD but keep local changes", KEEP),
OPT_BOOLEAN('p', "patch", &patch_mode, "select hunks interactively"),
OPT_END()
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options, git_reset_usage,
PARSE_OPT_KEEP_DASHDASH);
reflog_action = args_to_str(argv);
setenv("GIT_REFLOG_ACTION", reflog_action, 0);
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 01:16:36 +00:00
/*
* Possible arguments are:
*
* git reset [-opts] <rev> <paths>...
* git reset [-opts] <rev> -- <paths>...
* git reset [-opts] -- <paths>...
* git reset [-opts] <paths>...
*
* At this point, argv[i] points immediately after [-opts].
*/
if (i < argc) {
if (!strcmp(argv[i], "--")) {
i++; /* reset to HEAD, possibly with paths */
} else if (i + 1 < argc && !strcmp(argv[i+1], "--")) {
rev = argv[i];
i += 2;
}
/*
* Otherwise, argv[i] could be either <rev> or <paths> and
* has to be unambiguous.
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 01:16:36 +00:00
*/
else if (!get_sha1(argv[i], sha1)) {
/*
* Ok, argv[i] looks like a rev; it should not
* be a filename.
*/
verify_non_filename(prefix, argv[i]);
rev = argv[i++];
} else {
/* Otherwise we treat this as a filename */
verify_filename(prefix, argv[i]);
}
}
if (get_sha1(rev, sha1))
die(_("Failed to resolve '%s' as a valid ref."), rev);
commit = lookup_commit_reference(sha1);
if (!commit)
die(_("Could not parse object '%s'."), rev);
hashcpy(sha1, commit->object.sha1);
if (patch_mode) {
if (reset_type != NONE)
die(_("--patch is incompatible with --{hard,mixed,soft}"));
return interactive_reset(rev, argv + i, prefix);
}
/* git reset tree [--] paths... can be used to
* load chosen paths from the tree into the index without
* affecting the working tree nor HEAD. */
if (i < argc) {
if (reset_type == MIXED)
warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
else if (reset_type != NONE)
die(_("Cannot do %s reset with paths."),
_(reset_type_names[reset_type]));
return read_from_tree(prefix, argv + i, sha1,
quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN);
}
if (reset_type == NONE)
reset_type = MIXED; /* by default */
if (reset_type != SOFT && reset_type != MIXED)
setup_work_tree();
if (reset_type == MIXED && is_bare_repository())
die(_("%s reset is not allowed in a bare repository"),
_(reset_type_names[reset_type]));
/* Soft reset does not touch the index file nor the working tree
* at all, but requires them in a good order. Other resets reset
* the index file to the tree object we are switching to. */
if (reset_type == SOFT)
die_if_unmerged_cache(reset_type);
else {
int err;
if (reset_type == KEEP)
die_if_unmerged_cache(reset_type);
err = reset_index_file(sha1, reset_type, quiet);
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 04:25:57 +00:00
if (reset_type == KEEP)
err = err || reset_index_file(sha1, MIXED, quiet);
if (err)
die(_("Could not reset index file to revision '%s'."), rev);
}
/* Any resets update HEAD to the head being switched to,
* saving the previous head in ORIG_HEAD before. */
if (!get_sha1("ORIG_HEAD", sha1_old_orig))
old_orig = sha1_old_orig;
if (!get_sha1("HEAD", sha1_orig)) {
orig = sha1_orig;
prepend_reflog_action("updating ORIG_HEAD", msg, sizeof(msg));
update_ref(msg, "ORIG_HEAD", orig, old_orig, 0, MSG_ON_ERR);
}
else if (old_orig)
delete_ref("ORIG_HEAD", old_orig, 0);
prepend_reflog_action("updating HEAD", msg, sizeof(msg));
update_ref_status = update_ref(msg, "HEAD", sha1, orig, 0, MSG_ON_ERR);
switch (reset_type) {
case HARD:
if (!update_ref_status && !quiet)
print_new_head_line(commit);
break;
case SOFT: /* Nothing else to do. */
break;
case MIXED: /* Report what has not been updated. */
update_index_refresh(0, NULL,
quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN);
break;
}
remove_branch_state();
free(reflog_action);
return update_ref_status;
}